net: dpaa2-mac: move rtnl_lock() only around phylink_{,dis}connect_phy()

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After the introduction of a private mac_lock that serializes access to
priv->mac (and port_priv->mac in the switch), the only remaining purpose
of rtnl_lock() is to satisfy the locking requirements of
phylink_fwnode_phy_connect() and phylink_disconnect_phy().

But the functions these live in, dpaa2_mac_connect() and
dpaa2_mac_disconnect(), have contradictory locking requirements.
While phylink_fwnode_phy_connect() wants rtnl_lock() to be held,
phylink_create() wants it to not be held.

Move the rtnl_lock() from top-level (in the dpaa2-eth and dpaa2-switch
drivers) to only surround the phylink calls that require it, in the
dpaa2-mac library code.

This is possible because dpaa2_mac_connect() and dpaa2_mac_disconnect()
run unlocked, and there isn't any danger of an AB/BA deadlock between
the rtnl_mutex and other private locks.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

...

This commit is contained in:

Vladimir Oltean 2022-11-29 16:12:21 +02:00 • committed by Paolo Abeni

parent 3c7f44fa9c

commit 87db82cb61

3 changed files with 5 additions and 8 deletions

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4

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

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5

drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c

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4

drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c

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